Matthew Barrows, of the Sacramento Bee, reports San Francisco 49ers TE Vernon Davis said TE Brian Jennings has been mentoring him. Davis said, "Every day after practice, he'll stay out there with me, and he'll work on some things with me -- pass protection, run block, running routes. He's been here a long time."

Mike Duffy, of 49ers.com, reports San Francisco 49ers LS/TE Brian Jennings said his primary focus is on his health, so he can play as long as possible. "My goal isn't necessarily to snap the ball accurately," he said. "I don't spend my offseason just doing that. I spend my offseason trying to make myself a better person physically, spiritually, emotionally and mentally. The by-product of that goal is that I snap the ball accurately."

ESPN.com's Len Pasquarelli, as an update to earlier stories, reports the Detroit Lions have signed restricted free agent LS Brian Jennings (49ers) to a one-year, $805,000 offer sheet that includes a $200,000 signing bonus. The 49ers have one week to match the offer. If they choose not to, the Lions will owe them a seventh-round draft choice as compensation.

The San Jose Mercury News reports San Francisco 49ers TE Greg Clark has not come along as quickly as hoped in his rehabilitation from hamstring surgery. He remains on the PUP list for the team. Coach Steve Mariucci initially thought Clark could rejoin team practices by late next week. Now it looks like he could miss a second consecutive training camp because of injury. "He's simply not ready to participate yet," Mariucci said Saturday. With Clark out, Justin Swift, the backup last season, has taken the bulk of the practice snaps along with Brian Jennings.

According to the team's official site, San Francisco 49ers offensive coordinator said TE Greg Clark will remain the team's starter, but the team needs to add some depth behind him. "Greg is coming off a really good year," says 49ers offensive coordinator Greg Knapp. "He had career highs in yards and receptions and he stayed healthy all season." Clark's backups are Justin Swift, Terrence Dupree and Brian Jennings. Swift is expected to be given every chance to hang onto his No. 2 TE role. Dupree spent his rookie season on IR with a broken ankle. Jennings, also a long-snapper, saw no action at TE. Knapp also indicated the TE position could see an increased workload this season.